JP2008102209A - Action of upright piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an action of an upright piano that enables a key to be struck repeatedly with proper sensation of touch, using a very simple and low-cost constitution. <P>SOLUTION: The action 1 of the upright piano comprises: a wippen 6 which is freely rotatable and thrusted up by a key 4; a jack 7 attached to the wippen 6, which is thrusted and a hammer 3 is rotated accompanying the turning of the wippen 6, and which turns by contacting to a regulating button 17 during the turning, to leave from the hammer 3; a jack spring 11 provided between the wippen 6 and the jack 7, which energizes the jack 7 to the hammer 3 side; and an adjusting screw 10 which is screwed to a screw hole 6c formed on one side of the wippen 6 and the jack 7 by penetrating in the vertical directions, and which adjusts the projection length of the jack spring 11 from one side of the wippen 6 and the jack 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an action of an upright piano that operates in response to a key depression, rotates a hammer, and strikes a string.

  The action of an upright piano generally includes a pivotable whippen, a jack pivotally attached to the whippen, a jack spring provided between the whippen and the jack, and a regulating button located above the jack. , Equipped with back check etc. provided in Wippen.

  In such an action, as the key is depressed, the whippen is pushed up at the rear end of the key and pivots upward together with the jack, and the hammer is pushed up and pivoted by the pivoted jack. In the middle of this rotation, the jack comes into contact with the regulating button, rotates against the whippen against the spring force of the jack spring, and comes off the hammer. After that, the hammer rotates by inertia, hits the string, rotates in the opposite direction, and is locked to the back check. When the key depression is completed and the key is returned to a certain extent, the jack rotates together with the whippen in the opposite direction to the key depression, moves away from the regulating button, and the jack spring spring force causes the jack to It returns and pivots, enters under the hammer and engages. This makes it possible to re-throw the hammer, that is, to hit it repeatedly.

  As described above, in the upright piano, the jack spring has a function of ensuring continuous hitting performance by returning and turning the jack after pressing the key. For this reason, it is preferable to increase the spring force of the jack spring from the viewpoint of improving the hitting performance. However, since the spring force of the jack spring is transmitted to the performer's fingertip as a reaction force when pressing the key, if the spring force is too strong, the static load on the key increases and the spring is deformed. It becomes a “springy” touch feeling, and the touch feeling is lost.

  For this reason, as a conventional upright action designed to improve the continuous hitting performance without increasing the spring force of the jack spring, for example, one disclosed in Patent Document 1 is known. This action includes a repetition mechanism in addition to the normal parts described above. This repetition mechanism includes a flange attached to a catcher shank of a hammer, a repetition lever that is rotatably supported by the flange, and a lever spring that biases the repetition lever. In this action, when the key is returned to some extent after the key is pressed, the spring force of the lever spring acting via the repetition lever as the whippen and jack rotate in the opposite direction to the key pressing time, The hammer turns to the string side. Thereby, the jack can easily enter the lower side of the hammer, and the continuous hitting performance can be improved.

  However, in this conventional action, in addition to normal parts such as wippen, a repetition mechanism having a frenzy, repetition lever, spring, etc. must be provided, and its configuration is very complicated, and such a repetition mechanism However, there is a disadvantage that the manufacturing cost is very high. In addition, when the key is released, the spring force of the spring is applied to the hammer via the repetition lever, and the hammer is rotated toward the string side. Therefore, the spring force of the spring is prevented so that the hammer does not strike again by this rotation. In addition, the positional relationship between the repetition lever and the hammer needs to be finely adjusted, and the adjustment work requires a lot of labor, which further increases the manufacturing cost. Further, since the repetition mechanism is provided integrally with the hammer, the static load of the key is increased correspondingly, and the touch feeling and the operation of the hammer are adversely affected.

  The present invention has been made to solve the above-described problems, and provides an upright piano action capable of achieving both a good touch feeling and continuous hitting characteristics with a very simple and inexpensive configuration. The purpose is to do.

JP-A-6-83326

  In order to achieve the above object, the invention according to claim 1 is an action of an upright piano that operates when a key is pressed and turns a hammer to turn the key. A whippen that is pushed up by a key and pivots upward, a regulating button provided at a predetermined position above the whippen, and pivotally attached to the whippen, engaged with a hammer, and as the whippen rotates The hammer is pushed up and rotated, and in the middle of the rotation, by contacting the regulating button, it is rotated with respect to the whippen, and is provided between the whippen and the jack. A jack spring that biases the jack toward the hammer in order to engage the jack with the hammer after disengagement. A screw hole penetrating in the vertical direction is formed in one of the jack and the jack. The screw hole is screwed into the screw hole so as to freely advance and retreat, and is connected to a jack spring. An adjustment screw for adjusting the protruding length of the spring is further provided.

  According to the action of this upright piano, when the key is released, the jack is engaged with the hammer, and when the key is pressed from this released state, the whippen is pushed up by the key, and the jack together with the whippen is jacked. Pivots upward. The hammer is pushed up by the jack and rotates. In the middle of this rotation, the jack comes off from the hammer by abutting against the regulating button. After that, the hammer rotates by inertia and strikes a string. Furthermore, the jack released from the hammer can be returned to the whippen by the bias of a jack spring provided between the whippen and the jack, and the hammer can be pushed up again by engaging the hammer. It becomes a state.

  In the present invention, an adjustment screw is connected to the jack spring, and this adjustment screw is screwed into a screw hole penetrating in the vertical direction formed in one of the whippen and the jack. Therefore, the spring force of the jack spring can be adjusted steplessly by turning the adjusting screw and adjusting the protruding length of the jack spring from the whippen or jack in which the screw hole is formed.

  For example, if the protruding length of the jack spring is increased, the amount of compression of the jack spring in a state where it is in contact with the regulating button is increased, so that the spring force increases, so that the jack returns faster to the hammer side. Thus, the hitting performance can be improved. On the contrary, if the protruding length of the jack spring is reduced, the amount of compression of the jack spring when it is in contact with the regulating button will be reduced, and the spring force will be reduced, thus suppressing the “springy” feeling. And the touch feeling can be improved. As described above, by adjusting the protruding length of the jack spring with the adjusting screw, the spring force of the jack spring can be finely adjusted steplessly, and thus both a good touch feeling and continuous hitting can be achieved.

  In addition, the action of the present invention is basically configured only by adding an adjusting screw to a normal action, so that it is very simple and inexpensive compared with a conventional action that requires a complicated repetition mechanism. Can be configured. In addition, since the screw hole is formed in the whippen or jack and the adjustment screw is attached, the change in the weight of the whippen or jack due to the installation of the adjustment screw is small, and the effect of this on the static load of the key and the action action is almost negligible. Absent.

  The invention according to claim 2 is characterized in that, in the action of the upright piano according to claim 1, the adjusting screw is attached to the whippen.

  According to this configuration, screw holes and adjustment screws are provided on the whippen side, and no changes such as processing or addition of parts are made on the jack side, so the desired operation of the jack can be adjusted. Can be easily obtained. Further, the jack spring can be stably supported from the lower side by the adjusting screw protruding upward from the wippen. In addition, since an upright piano generally has a relatively large space below the wippen, the adjustment work can be easily performed by operating the adjustment screw from below the wippen. it can.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an action 1, keyboard 2, hammer 3 and the like of an upright piano to which the present invention is applied in a key release state. In FIG. 1, hatching indicating a cross section is omitted for convenience of illustration. The keyboard 2 is composed of a large number of keys 4 (only one white key is shown) arranged in the left-right direction (depth direction in FIG. 1), and each key 4 is centered in the front-rear direction (left-right direction in FIG. 1). In FIG. 5, the rod 5 is supported so as to be swingable through a balance pin 5a.

  The action 1 is attached to the left and right brackets (not shown) provided on the left and right ends of the keyboard 5 above the rear end of the keyboard 2, and is provided between the brackets. Action 1 has a whippen 6 and a jack 7, which are provided for each key 4 (only one is shown). A center rail 15 and a hammer rail 16 are passed between the left and right brackets.

  The wippen 6 is formed in a predetermined shape by, for example, a synthetic resin, has a heel portion 6a protruding downward from the front portion thereof, and a capstan button provided at the rear end portion of the upper surface of the corresponding key 4 4a is placed via a heel portion 6a. Further, a back check wire 8a is erected at the front end portion of the wippen 6, and the back check 8 is attached to the tip end portion thereof. Further, a spoon 9 for driving a damper 21 described later is erected at the rear end portion of the wippen 6. Further, the whippen 6 is rotatably supported by the whippen flange 6b fixed to the center rail 15 at a portion immediately in front of the spoon 9.

  As shown in FIG. 2, a screw hole 6c penetrating in the vertical direction is formed between the heel portion 6a of the wippen 6 and the back check wire 8a, and the adjusting screw 10 is screwed into the screw hole 6c from below. It is. The adjustment screw 10 does not have a head and has a constant diameter except for the tip portion, and a groove 10a for driver operation is formed on the end surface of the base portion.

  A jack spring 11 is attached to the adjustment screw 10. The jack spring 11 is for returning and turning the jack 7 after pressing the key, and is constituted by a coil spring. The lower end of the jack spring 11 is fitted and bonded to the tip of the adjustment screw 10 and protrudes upward from the screw hole 6 c of the wippen 6. The upper end of the jack spring 11 contacts the lower surface of the base 7 a of the jack 7. ing.

  The jack 7 is formed in, for example, an L shape with a synthetic resin, and as shown in FIG. 2, a base portion 7a that extends short in the front-rear direction, and a hammer push-up that extends upward substantially perpendicularly from the rear end portion of the base portion 7a. It has a portion 7b. The jack 7 is pivotally attached to a portion on the rear side of the back check wire 8a of the wippen 6 at a corner portion between the base portion 7a and the hammer push-up portion 7b.

  A regulating button 17 is provided at a predetermined position above the base 7 a of the jack 7. This regulating button 17 is attached to each key 4 via a plurality of regulating brackets 18 (only one shown) provided on the center rail 15 and a regulating rail 19 attached to the front end and extending in the left-right direction. Is provided.

  A bat 20 is rotatably attached to the center rail 15 via a butt flange 20a, and the hammer 3 is provided integrally with the bat 20. The hammer 3 integrally has a hammer shank 3a extending upward from the bat 20 and a hammer head 3b extending rearward from the upper end portion thereof. In the key release state, the hammer shank 3a is opposed to the hammer rail 16 at a minute interval, and the hammer head 3b is opposed to the rearward string S stretched vertically.

  Further, a catcher 20b is provided on the bat 20 so as to protrude forward, and the catcher 20b is located behind the back check 8 described above and is opposed thereto. Further, the bat 20 is provided with a bat spring 20c for urging the hammer 3 clockwise in FIG. In the key release state, the hammer push-up portion 7b of the jack 7 is engaged with the bat 20 from below.

  Further, behind the action 1, a damper 21 is provided for each key 4 (only one is shown). The damper 21 includes a damper lever 21b rotatably attached to the center rail 15 via a damper flange 21a, a damper head 21d attached to the upper side of the damper lever 21b via a damper wire 21c, and a damper head 21d. The damper lever spring 21e is biased toward the string S side. The damper 21 is for making a sound stop when the damper head 21d comes into contact with the string S by the urging force of the damper lever spring 21e when the key is released.

  Next, a series of operations from the start to the end of key pressing such as the action 1 and the hammer 3 described above will be described. When the key is pressed by the performer, the key 4 is rotated clockwise in FIG. 1, and the wippen 6 is pushed up by the key 4 and rotated upward (counterclockwise). As the whippen 6 rotates, the jack 7 moves upward together with the whippen 6, and the hammer 3 is pushed up by the hammer push-up portion 7 b of the jack 7 through the bat 20, thereby moving toward the string S. Turn counterclockwise.

  When the whippen 6 rotates by a predetermined angle, the base 7a of the jack 7 comes into contact with the regulating button 17, so that the upward movement of the jack 7 is restricted. When the whippen 6 further rotates, the jack 7 rotates clockwise with respect to the whippen 6 while being in contact with the regulating button 17. As the jack 7 rotates, the jack spring 11 disposed between the jack 7 and the whippen 6 is compressed.

  When the key depression is further advanced, the jack 7 further rotates clockwise while compressing the jack spring 11. Then, immediately before the key 4 is fully pressed, when the pivot stroke (hereinafter referred to as “jack stroke”) SJ of the jack 7 with respect to the wippen 6 reaches a predetermined stroke SJLO (see FIG. 3), the hammer thrusting portion 7b The jack 7 is detached from the hammer 3 by moving forward from 20. As a result, the weight of the hammer 3 is abruptly lost from the touch weight of the key 4, thereby giving the player a let-off feeling. After the jack 7 is detached, the hammer 3 is rotated by inertia, and the string S is struck to generate a performance sound. The hammer 3 is returned and rotated clockwise by the spring force of the butt spring 20c, and the catcher 20b is locked to the back check 8 to temporarily stop.

  When the key depression is completed and the key 4 is released, the key 4 and the whippen 6 rotate in the opposite direction to that during key depression. Along with this, the jack 7 returns and rotates counterclockwise with respect to the wippen 6 by the spring force of the compressed jack spring 11, and the hammer push-up portion 7 b enters the lower side of the bat 20. Further, when the back check 8 is separated from the catcher 20b by the return rotation of the wippen 6, the bat 20 is engaged with the hammer push-up portion 7b of the jack 7, and the hammer 3 is returned to the key release state. Thus, a series of actions of action 1 from the time of key depression to the time of key release is completed.

  In this action 1, the spring force FJS of the jack spring 11 can be adjusted by the adjustment screw 10 attached to the wippen 6. Specifically, as shown in FIG. 2, when the driver D is inserted into the groove 10 a of the adjustment screw 10 from below and, for example, the adjustment screw 10 is rotated upward, the jack spring 11 integrated therewith is moved upward. By moving, the protruding length of the jack spring 11 from the upper surface of the wippen 6 becomes larger. Accordingly, the compression amount of the jack spring 11 becomes larger as a whole, and the spring force FJS of the jack spring 11 with respect to the jack stroke SJ increases as a whole as shown in FIG. The spring force FJS when rotating is also increased. As a result, after the key is pressed, the jack 7 returns faster to the hammer 3 side, and better continuous hitting performance can be obtained.

  On the other hand, when the adjustment screw 10 is moved downward, the jack spring 11 moves downward, and the protruding length from the upper surface of the wippen 6 becomes smaller. Accordingly, the compression amount of the jack spring 11 becomes smaller as a whole, and the spring force FJS of the jack spring 11 with respect to the jack stroke SJ decreases as a whole as shown in FIG. Sensation can be suppressed and touch feeling can be improved.

  As described above, by adjusting the protruding length of the jack spring 11 with the adjusting screw 10, the spring force FJS of the jack spring 11 can be finely adjusted steplessly. Can do.

  In addition, the action 1 of the present embodiment is basically configured simply by adding the adjusting screw 10 to a normal action, so that it is very simple compared to a conventional action that requires a complicated repetition mechanism. And it can be configured at low cost. Further, since the screw hole 6c is formed in the whippen 6 and the adjusting screw 10 is attached, the amount of change in the weight of the whippen 6 due to the attachment of the adjusting screw 10 is small, and thereby the static load of the key 4 and the action of the action 1 can be reduced. There is almost no impact.

  Further, since no changes such as processing or addition of parts are applied to the jack 7 side, a desired operation of the jack 7 can be easily obtained without requiring adjustment. Further, the jack spring 11 can be stably supported from the lower side by the adjusting screw 10 protruding upward from the whippen 6. In addition, since an upright piano generally has a relatively large space on the lower side of the wippen 6, the adjustment screw 10 can be easily operated from the lower side of the wippen 6 by the driver D by using this space, and the adjustment is performed. Work can be done easily.

  FIG. 4 shows a modification to the embodiment. In this modification, only the configuration in which the adjustment screw 10 and the jack spring 11 are attached to the action 1 of the embodiment is changed.

  Specifically, a screw hole 6d is formed in the lower part of the wippen 6, and a spring receiving hole 6e having a larger diameter is formed in the upper part of the wippen 6 so as to continue to the screw hole 6d. A disc-shaped spring receiver 31 is fixed to the tip of the adjustment screw 10. The adjusting screw 10 is screwed into the screw hole 6d from above, so that the groove 10a of the adjusting screw 10 faces the open lower surface of the screw hole 6d and the spring receiver 31 is received in the spring receiver receiving hole 6e. It is like that. The jack spring 11 is provided between the spring receiver 31 and the base portion 7 a of the jack 7 in a state of being placed on the spring receiver 31.

  According to the above configuration, the protruding length of the jack spring 11 from the wippen 6 can be adjusted steplessly by turning the adjusting screw 10 with the driver D and moving it up and down, and thus the effect of the first embodiment described above can be achieved. It can be obtained similarly.

  FIG. 5 shows another modification of the embodiment. In this modification, the adjustment screw 10 is attached to the jack 7 in the embodiment, whereas the adjustment screw 10 is attached to the jack 7. Specifically, a screw hole 7c penetrating in the vertical direction is formed in the base portion 7a of the jack 7, and the adjusting screw 10 is screwed into the screw hole 7c from above. The upper end of the jack spring 11 is fitted and bonded to the tip (lower end) of the adjustment screw 10, and the lower end is in contact with the upper surface of the wippen 6.

  According to this configuration, the protruding length of the jack spring 11 from the lower surface of the jack 7 can be adjusted steplessly by turning the adjusting screw 10 from above with the screwdriver D. Therefore, the effect of the first embodiment described above can be achieved. It can be obtained similarly.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the embodiment, the adjustment screw 10 and the jack spring 11 are connected by fitting and adhesion to the adjustment screw 10 or placement on the spring receiver 31, but other appropriate connection means are used. Of course it is good.

  In the embodiment, a jack spring having a linear spring characteristic is used. However, a spring having a non-linear spring characteristic, for example, an unequal pitch coil spring may be adopted. Thereby, the spring force can be set more finely by the combination of the protruding length of the jack spring and the non-linear characteristic. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

It is a side view which shows the action by one Embodiment of this invention in a key release state. FIG. 2 is a partially cutaway enlarged side view showing a portion such as a jack of the action of FIG. 1. It is a figure which shows the relationship of the protrusion length of a jack spring, the jack stroke, and the spring force of a jack spring in the action of FIG. It is a partially broken enlarged side view similar to FIG. 2, showing an action according to a modification of the embodiment. It is a partially broken enlarged side view similar to FIG. 2, showing an action according to another modification of the embodiment.

Explanation of symbols

1 Action 3 Hammer 4 Key 6 Whippen 6c Screw Hole 6d Screw Hole 7 Jack 7c Screw Hole 10 Adjustment Screw 11 Jack Spring 17 Regulating Button

Claims (2)

It is an action of an upright piano that operates in response to pressing of a key and performs string striking by rotating a hammer,
When pressing the key, the whippen pushed up by the key and rotating upwards;
A regulating button provided at a predetermined position above the whippen;
It is pivotally attached to the whippen, engages with the hammer, pushes up the hammer as the whippen rotates, rotates it, and abuts the regulating button during the rotation. The jack rotates with respect to the whippen and is detached from the hammer,
A jack spring provided between the whippen and the jack and biasing the jack toward the hammer in order to re-engage the jack with the hammer after the disengagement,
One of the whippen and the jack is formed with a screw hole penetrating in the vertical direction,
An adjustment screw that is screwed into the screw hole so as to freely advance and retract, is connected to the jack spring, and adjusts a protruding length of the jack spring from the one of the whippen and the jack by a rotating operation. Characteristic upright piano action.   The action of the upright piano according to claim 1, wherein the adjusting screw is attached to the whippen.

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